Article 220—Load Calculations: 220.14 Motors The National Electrical Code (NEC) contains an introduction, nine chapters and annexes. An outline showing Code arrangement is in 90.3. Chapters 1 through 4 apply generally...
According to the National Electrical Code, Part 2 In 725.23, The National Electrical Code (NEC) covers overcurrent protection (OCP) for Class 1 circuits. Plainly stated, this section allows the ampacity of the conductors to...
A class 1 circuit is the portion of the wiring system between the load side of the overcurrent protection device (OCPD) or the power-limited supply and the connected load. For example, Class 1 power-limited circuits are...
Cabling gurus have been working feverishly to develop an unshielded twisted pair cable (UTP) that will support 10 gigabit Ethernet (10GbE), but it has not been easy. The standardization of a higher performance Cat 6 cable is...
ARC-FAULT CIRCUIT INTERRUPTERS (AFCIs) first made their appearance in the National Electrical Code (NEC) in 1999, with a mandatory effective date of Jan. 1, 2002. Research—conducted by Underwriters Laboratories Inc. (UL) for...
A new definition covering supplementary overcurrent-protective devices has been added to Article 100 in the 2005 National Electrical Code (NEC) to indicate that limited protection may be provided for specific applications or...
Arc-fault circuit-interrupter(AFCI) protection requirements were first submitted to the National Electrical Code (NEC) process for the 1996 NEC but were not accepted until the 1999 NEC. These requirements as detailed in...
220.19 Electric Ranges and Other Cooking Appliances Specifications for calculating branch-circuit, feeder and service loads are in Article 220 of the National Electrical Code. This article is divided into four parts: I...
220.19 Electric Ranges and Other Cooking Appliances Branch-circuit, feeder and service-load calculation provisions are in Article 220 of the National Electrical Code. While Part I is titled “General,” most of the first part...
What do these statements have in common? • Lightning doesn’t strike the same place twice. • Electrical utilities correct a fault by sending a power surge to clear a short in a service line, transformer or other load grid...
In many conversations with electrical inspectors on the subject of arc-fault circuit-interrupters (AFCIs), I find them variously questioning, doubtful, confused, bewildered and puzzled concerning the application of 210.12...
Article 220 contains provisions for calculating branch-circuit, feeder and service loads. Following the requirements set forth in this article will provide the minimum size branch circuit, feeder or service. This information...
Though lightning season may be over by now, it is worth reviewing the impact storms can have on the operation of a facility. Some may have experienced significant damage to equipment from the high frequency transient energy...
210.52(C)(3) Peninsular Counter Spaces Article 210 covers branch circuits except those that supply only motor loads. Motor load requirements are covered in Article 430. Receptacle placement provisions for dwelling units are...
